import React, { Component } from 'react'

export default class Item extends Component {

  state = {
    mouse: false
  }
  handleMouse = (flag) => {
    return () => {
      this.setState({ mouse: flag })
    }
  }
  handleCheck = id => {
    return event => {
      this.props.updateTodo(id, event.target.checked)
    }
  }
  handleDelete = (id, event) => {
    if (window.confirm('确定删除吗？')) {
      this.props.deleteTodo(id)
    }
  }

  render() {
    const { id, name, done } = this.props
    const { mouse } = this.state
    return (
      <li style={{ backgroundColor: mouse ? '#ddd' : 'white' }} onMouseEnter={this.handleMouse(true)} onMouseLeave={this.handleMouse(false)}>
        <label>
          <input ref={inputRef => this.inputRef = inputRef} type="checkbox" checked={done} onChange={this.handleCheck(id)} />
          <span>{name}</span>
        </label>
        <button onClick={event => this.handleDelete(id, event)} className="btn btn-danger" style={{ display: mouse ? 'block' : 'none' }}>删除</button>
      </li>
    )
  }
}
